function saveTextAsFile(fileNameToSaveAs, textToWrite) {
var textFileAsBlob = new Blob([textToWrite], {
    type: 'text/plain'
});

var downloadLink = document.createElement("a");
downloadLink.download = fileNameToSaveAs;
downloadLink.innerHTML = "Download File";

if (true) { //window.webkitURL !== null) {
    // Chrome allows the link to be clicked
    // without actually adding it to the DOM.
    downloadLink.href = window.URL.createObjectURL(textFileAsBlob);
} else {
    // Firefox requires the link to be added to the DOM
    // before it can be clicked.
    downloadLink.href = window.URL.createObjectURL(textFileAsBlob);
    downloadLink.onclick = destroyClickedElement;
    downloadLink.style.display = "none";
    document.body.appendChild(downloadLink);
}

downloadLink.click();
}

downloadLink.click();

SCRIPT5: Access is denied.

window.navigator.msSaveBlob(blob, 'file.txt');

window.navigator.msSaveOrOpenBlob(blob, 'file.txt');

function saveTextAsFile(fileNameToSaveAs, textToWrite) {
    var ie = navigator.userAgent.match(/MSIEs([d.]+)/),
        ie11 = navigator.userAgent.match(/Trident/7.0/) && navigator.userAgent.match(/rv:11/),
        ieVer=(ie ? ie[1] : (ie11 ? 11 : -1));

    if (ie && ieVer<10) {
        console.log("No blobs on IE ver<10");
        return;
    }

    var textFileAsBlob = new Blob([textToWrite], {
        type: 'text/plain'
    });

    if (ie || ie11) {
        window.navigator.msSaveBlob(textFileAsBlob, fileNameToSaveAs);
    } else {
        var downloadLink = document.createElement("a");
        downloadLink.download = fileNameToSaveAs;
        downloadLink.innerHTML = "Download File";

        if (window.webkitURL !== null) {
            // Chrome allows the link to be clicked
            // without actually adding it to the DOM.
            downloadLink.href = window.webkitURL.createObjectURL(textFileAsBlob);
        } else {
            // Firefox requires the link to be added to the DOM
            // before it can be clicked.
            downloadLink.href = window.URL.createObjectURL(textFileAsBlob);
            downloadLink.onclick = destroyClickedElement;
            downloadLink.style.display = "none";
            document.body.appendChild(downloadLink);
        }

        downloadLink.click();
    }
}